In a video message, he said: “There’s still time to offer people the choice of an exit from Brexit; there’s a big opportunity to win a real cash injection for the NHS and for schools; and to win the argument for thousands more affordable homes.”

“All over the country people are getting behind these campaigns by joining and supporting the Liberal Democrats.”

He urged his party to “get back to what we’re good at” by mobilising grassroots supporters, adding “let’s make 2018 our year”.